1610421731257 has 2 divisors, whose sum is σ = 1610421731258. Its totient is φ = 1610421731256.

The previous prime is 1610421731231. The next prime is 1610421731287. The reversal of 1610421731257 is 7521371240161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1568195180176 + 42226551081 = 1252276^2 + 205491^2 .

It is a cyclic number.

It is not a de Polignac number, because 1610421731257 - 2⁷ = 1610421731129 is a prime.

It is not a weakly prime, because it can be changed into another prime (1610421731227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 805210865628 + 805210865629.

It is an arithmetic number, because the mean of its divisors is an integer number (805210865629).

Almost surely, 2^{1610421731257} is an apocalyptic number.

It is an amenable number.

1610421731257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1610421731257 is an equidigital number, since it uses as much as digits as its factorization.

1610421731257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 70560, while the sum is 40.

The spelling of 1610421731257 in words is "one trillion, six hundred ten billion, four hundred twenty-one million, seven hundred thirty-one thousand, two hundred fifty-seven".